Air Compressor Pressure Switch Unloader Valve

The unloader valve that is shown in the image above is typically found on the side of a compressor pressure switch and is operated by a toggle lever coming out of the side of the pressure switch.

Air compressor pressure switch unloader valve.

This short video shows the various types of unloader valves available. Make offer air compressor pilot unloader valve bg1 m 110 135 psi rolair 131b gas electric 4 port air compressor pressure switch control valve 95 125 psi electric unloader 18 09. Other compressor pressure switches have integral unloader valves. Regardless of the location when the air pressure in the storage tank reaches the cut out pressure the pressure switch turns off which also stops the air compressor.

What the unloader valve does is that is responds to the compressor pressure switch turning the power off to the motor and allows any air that may be trapped over the piston or pistons on a multi cylinder air compressor to vent to atmosphere removing any load that the trapped air may have created over the cylinder piston. You can spot those by looking under the pressure switch and seeing if there is an. Can i use a switch with an unloader valve if older compressor did not have one. The pressure switch of your air compressor can either have an internal or external unloader valve.

The air pressure range is 90 120 and there is no unloader valve or plumbing for one. It blows off the pressure inside the discharge pipe when the compressor stops there is another type of unloader valve which can be found at the inlet of rotary screw compressors also called inlet valve or loading valve. Have same situation as tom with older large dual tank snap on compressor with failing air pressure switch. The air compressor unloader is valve is a small but important part of the reciprocating piston compressor.

These valves bleed off or unload excess air in the lines so your air compressor can easily start up. We carry popular unloader valves used on many types and brands of pressure switches for air compressors.